Organic Chemistry Quizzes for Sixth Form College Year 12

Question 1

In an electrophilic addition reaction, which species accepts the electron pair?

Accepted Answer

Electrophile

Answer

Nucleophile

Answer

Catalyst

Answer

Base

Question 2

Identify the reaction that does not belong to the category of organic reactions:

Accepted Answer

Hydrolysis

Answer

Electrophilic substitution

Answer

Nucleophilic addition

Answer

Polymerization

Question 3

Which reagent would yield the highest percentage of but-1-ene when reacted with 1-bromobutane?

Accepted Answer

Potassium tert-butoxide in tert-butanol

Answer

Sodium hydroxide solution

Answer

Sodium iodide solution

Answer

Concentrated sulfuric acid

Question 4

Identify the reaction that does not involve a nucleophile:

Accepted Answer

Br2 addition to an alkene

Answer

HCN addition to an aldehyde

Answer

H2O addition to an alkene

Answer

NH3 addition to a ketone

Question 5

Determine the IUPAC name for the organic compound with the molecular formula CH3CH(Cl)CH2CH3.

Accepted Answer

1-Chloro-2-methylpropane

Answer

2-Chloro-1-methylpropane

Answer

1-Methyl-2-chloropropane

Answer

2-Methyl-1-chloropropane

Question 6

Which functional group characterizes alkenes?

Accepted Answer

Double bond

Answer

Carbonyl group

Answer

Hydroxyl group

Answer

Carboxylic acid group

Question 7

Which reaction illustrates nucleophilic addition?

Accepted Answer

CH3CH2CH=CH2 + HBr → CH3CH2CH(Br)CH3

Answer

CH3CH2OH + HCl → CH3CH2Cl + H2O

Answer

CH3CH2COOH + NaOH → CH3CH2COONa + H2O

Answer

CH3CH2OH + SOCl2 → CH3CH2Cl + SO2 + HCl

Question 8

Which of the following compounds exhibits the strongest intermolecular forces due to hydrogen bonding?

Accepted Answer

Methanol

Answer

Methane

Answer

Ethane

Answer

Propane

Question 9

Which reaction is NOT characteristic of alkenes?

Accepted Answer

Nucleophilic substitution

Answer

Electrophilic addition

Answer

Free radical addition

Answer

Polymerization

Question 10

In organic chemistry, which reagent is used to selectively convert an alkene into a vicinal diol (a compound with two hydroxyl groups on adjacent carbon atoms) through a permanganate diol reaction?

Accepted Answer

Potassium permanganate (KMnO₄)

Answer

Sodium borohydride (NaBH₄)

Answer

Lithium aluminium hydride (LiAlH₄)

Answer

Hydrogen gas (H₂) with a palladium catalyst

Question 11

Which intermolecular force is the strongest?

Accepted Answer

Hydrogen bonding

Answer

Dipole-dipole forces

Answer

London dispersion forces

Answer

Ion-dipole forces

Question 12

Which of the following reagents is used to form a Grignard reagent?

Accepted Answer

RMgX

Answer

NaBH4

Answer

LiAlH4

Answer

SOCl2

Question 13

Which reaction is NOT typical of alkenes?

Accepted Answer

Substitution with sodium hydroxide

Answer

Addition of hydrogen

Answer

Addition of bromine

Answer

Polymerization

Question 14

You want to synthesize 1-propanol using a suitable reagent. Which of the following reagents would be inappropriate for this purpose?

Accepted Answer

Potassium permanganate (KMnO4)

Answer

Sodium borohydride (NaBH4)

Answer

Lithium aluminium hydride (LiAlH4)

Question 15

Which of the following is NOT a typical product of an electrophilic addition reaction of an alkene?

Accepted Answer

Ketone

Answer

Alkyl halide

Answer

Alcohol

Answer

Epoxide

Question 16

Identify the reaction that does NOT follow electrophilic addition mechanism:

Accepted Answer

Water addition to butyne

Answer

HBr addition to propene

Answer

Cl2 addition to ethene

Answer

NH3 addition to formaldehyde

Question 17

Identify the functional group that distinguishes alkenes from other organic compounds:

Accepted Answer

Carbon-carbon double bond

Answer

Carbonyl group

Answer

Hydroxyl group

Answer

Carboxyl group

Question 18

Identify the reaction type that does not involve organic compounds:

Accepted Answer

Redox

Answer

Addition

Answer

Substitution

Answer

Polymerization

Question 19

When an alkene reacts with hydrogen bromide, which mechanism is involved?

Accepted Answer

Electrophilic addition

Answer

Nucleophilic addition

Answer

Radical addition

Question 20

Which of the following reactions would be most likely to produce a tertiary alcohol as the major product?

Accepted Answer

Reaction of 2-methylpropene with HBr

Answer

Reaction of propene with HBr

Answer

Reaction of 2-methylpropene with HCl

Answer

Reaction of 1-butene with H2O

Question 21

Predict the major product formed when 1 mole of carboxylic acid (RCOOH) reacts with 1 mole of thionyl chloride (SOCl2) in pyridine. Explain the mechanism of this reaction.

Accepted Answer

Acid chloride (RCOCl)

Answer

Alkyl halide (R'X)

Answer

Anhydride ((RCO)2O)

Answer

Ester (RCOOR')

Question 22

Which NMR technique is specifically designed to provide detailed information about the connectivity of atoms and functional groups in complex organic molecules?

Accepted Answer

2D NMR Spectroscopy (e.g., COSY, HSQC)

Answer

1H NMR Spectroscopy

Answer

13C NMR Spectroscopy

Answer

Mass Spectrometry

Question 23

Among the following types of intermolecular forces, which one is the strongest?

Accepted Answer

Hydrogen bonding

Answer

Dipole-dipole interactions

Answer

London dispersion forces

Answer

Ion-dipole interactions

Question 24

What is the hybridization state of the carbon atoms in ethane (CH3-CH3)?

Accepted Answer

sp³

Answer

sp

Answer

sp²

Answer

sp³d

Question 25

Which of the following reactions is an example of a nucleophilic substitution reaction?

Accepted Answer

CH₃Br + NaOH → CH₃OH + NaBr

Answer

CH₃CH₂Br + Mg → CH₃CH₂MgBr

Answer

CH₃CH=CH₂ + H₂ → CH₃CH₂CH₃

Answer

CH₃COOH + CH₃OH → CH₃COOCH₃ + H₂O

Question 26

What is the IUPAC name for the compound CH₃CH(OH)CH₂CH₃?

Accepted Answer

Propan-2-ol

Answer

1-Propanol

Answer

2-Propanol

Answer

Propan-1-ol

Question 27

Which compound has the highest boiling point among the following?

Accepted Answer

Methanoic acid

Answer

Ethane

Answer

Ethanol

Answer

Butane

Question 28

What is the mechanism of the following reaction: CH₃CH₂Br + NaOH → CH₃CH₂OH + NaBr?

Accepted Answer

SN2

Answer

SN1

Answer

E1

Answer

E2

Question 29

Which spectroscopic technique is primarily used to identify functional groups in organic compounds?

Accepted Answer

Infrared (IR) spectroscopy

Answer

Mass spectrometry

Answer

Nuclear magnetic resonance (NMR) spectroscopy

Answer

Ultraviolet-visible (UV-Vis) spectroscopy

Question 30

Suggest a viable synthetic route to obtain 2-methylpropene from 2-methylpropan-2-ol. Provide a brief explanation for your choice.

Accepted Answer

Dehydration using concentrated sulfuric acid

Answer

Reaction with sodium ethoxide in ethanol

Answer

Heating with potassium permanganate solution

Answer

Reaction with hydrogen bromide in the presence of peroxides

Question 31

Which of the following is the correct IUPAC name for the compound with the molecular formula C6H14?

Accepted Answer

3-Methylhexane

Answer

2-Methylpentane

Answer

4-Methylheptane

Answer

5-Methylnonane

Question 32

What is the hybridization of the carbon atom in the functional group of an alcohol?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 33

What is the mechanism of the substitution reaction between an alkyl halide and a hydroxide ion?

Accepted Answer

SN2

Answer

SN1

Answer

E1

Answer

E2

Question 34

Which of the following compounds is a resonance hybrid?

Accepted Answer

Benzene

Answer

Methane

Answer

Ethene

Answer

Methanol

Question 35

What is the primary role of a catalyst in an organic reaction?

Accepted Answer

To decrease the activation energy of the reaction

Answer

To increase the rate of the reaction

Answer

To change the products of the reaction

Answer

To provide a new pathway for the reaction

Question 36

According to the Cahn-Ingold-Prelog (CIP) rules, which functional group has the highest priority?

Accepted Answer

Carboxylic acid

Answer

Alcohol

Answer

Aldehyde

Answer

Ketone

Question 37

What is the product of the reaction between CH3CH2CH=CH2 and H2O?

Accepted Answer

CH3CH2CH(OH)CH3

Answer

CH3CH2CH2CHO

Answer

CH3CH2CH2CH2OH

Answer

No reaction

Question 38

Which of the following statements about nucleophilic substitution reactions is incorrect?

Accepted Answer

The rate of an SN2 reaction is independent of the concentration of the nucleophile.

Answer

They are typically unimolecular (SN1) or bimolecular (SN2) reactions.

Answer

SN1 reactions proceed through a carbocation intermediate.

Answer

SN2 reactions occur with inversion of configuration at the reaction center.

Question 39

What is the major product of the reaction between CH3CH2CH2Br and NaNH2?

Accepted Answer

CH3CH2CH2NH2

Answer

(CH3CH2CH2)2NH

Answer

CH3CH=CH2

Answer

No reaction

Question 40

What is the product of the reaction between C6H5COOH and SOCl2?

Accepted Answer

C6H5COCl

Answer

(C6H5CO)2O

Answer

C6H5SO2Cl

Answer

No reaction

Question 41

Which of the following reactions is used to synthesize ethers?

Accepted Answer

Williamson ether synthesis

Answer

SN2 reaction

Answer

E2 reaction

Answer

Diels-Alder reaction

Question 42

What is the correct IUPAC name for the alcohol with the structure CH3CH(OH)CH2CH(CH3)2?

Accepted Answer

2-methyl-3-butanol

Answer

3-methyl-2-butanol

Answer

2-ethyl-2-propanol

Answer

1-methyl-3-pentanol

Question 43

Which of the following reactions is used to convert an alcohol into an alkene?

Accepted Answer

Dehydration

Answer

Reduction

Answer

Oxidation

Answer

Substitution

Question 44

What is the product of the reaction between ethanoic acid and sodium hydroxide?

Accepted Answer

Sodium ethanoate and water

Answer

Ethyl acetate and water

Answer

Sodium acetate and ethanol

Answer

Ethanoic acid and sodium

Question 45

Which of the following is a characteristic physical property of aldehydes?

Accepted Answer

Strong odor

Answer

High boiling point

Answer

Low melting point

Answer

Insoluble in water

Question 46

Which of the following reactions is used to convert an amine into an amide?

Accepted Answer

Acylation

Answer

Reduction

Answer

Oxidation

Answer

Alkylation

Question 47

What is the product of the reaction between aniline and benzoyl chloride?

Accepted Answer

Benzanilide

Answer

Acetanilide

Answer

Phenacetin

Answer

Aspirin

Question 48

Which reagent and conditions would be most suitable for the complete hydrogenation of an alkene to the corresponding alkane?

Accepted Answer

H2, Pd/C, room temperature

Answer

LiAlH4 in dry ether

Answer

NaBH4 in methanol

Answer

Zn, HCl

Question 49

Explain alkene addition polymerization and provide an example of its use in the production of a common plastic.

Accepted Answer

Addition of monomers to an alkene double bond, forming linear or branched polymers. These polymers are used to make plastics like polyethylene and polypropylene.

Answer

Removal of a hydrogen atom from an alkene, creating polymers used in biodegradable plastics.

Answer

Condensation reaction between two alkenes, resulting in polymers used to make synthetic rubber.

Answer

Rearrangement of an alkene double bond, leading to polymers used in food packaging.

Question 50

Which functional group is present in ethanol (CH3CH2OH)?

Accepted Answer

Alcohol

Answer

Aldehyde

Answer

Ketone

Answer

Carboxylic acid

Question 51

The reaction between an alcohol and a carboxylic acid in the presence of an acid catalyst is known as:

Accepted Answer

Esterification

Answer

Neutralization

Answer

Saponification

Answer

Polymerization

Question 52

Which of the following is a strong nucleophile?

Accepted Answer

OH-

Answer

H+

Answer

CH3+

Answer

Cl-

Question 53

Which of the following is a defining characteristic of organic compounds?

Accepted Answer

Contain carbon

Answer

Ionic bonding

Answer

Low solubility in water

Answer

High melting point

Question 54

Which functional group is responsible for the acidic nature of carboxylic acids?

Accepted Answer

-COOH

Answer

-NH2

Answer

-OH

Answer

-C=O

Question 55

Which reaction illustrates nucleophilic addition?

Accepted Answer

Reaction of an aldehyde with HCN

Answer

Addition of bromine to an alkene

Answer

Elimination of water from an alcohol

Answer

Substitution of a halogen in an alkyl halide

Question 56

Which of the listed compounds would exhibit the highest boiling point?

Accepted Answer

n-Butane

Answer

Propane

Answer

Isobutane

Answer

2-Methylpropane

Question 57

Identify the major product of the following reaction: CH3CH=CHCH3 + HBr

Accepted Answer

CH3CHBrCH2CH3

Answer

CH2BrCH=CHCH3

Answer

CH3CH2CHBrCH3

Answer

CH2=CHCH2Br

Question 58

Which reaction is classified as an SN2 substitution?

Accepted Answer

Reaction of a methyl halide with hydroxide ion

Answer

Reaction of an aromatic halide with a strong nucleophile

Answer

Reaction of a tertiary alkyl halide with a weak nucleophile

Question 59

Determine the hybridization of the central carbon atom in the molecule: CH3-CH=CH-CH3

Accepted Answer

sp2

Answer

sp3

Answer

sp3d

Answer

sp

Question 60

Which of the following functional groups is responsible for the acidity of carboxylic acids?

Accepted Answer

-COOH

Answer

-OH

Answer

-NH2

Answer

-C=O

Question 61

What is the hybridization state of the carbon atoms in ethene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 62

Which of the following reactions is an example of electrophilic addition?

Accepted Answer

Addition of HCl to an alkene

Answer

Rearrangement of a carbocation

Answer

Elimination of water from an alcohol

Answer

Substitution of an alkyl halide with NaOH

Question 63

What is the major product of the following reaction?
CH3CH=CH2 + H2 (in the presence of Ni catalyst)

Accepted Answer

CH3CH2CH3

Answer

CH3CHO

Answer

CH3CH2CH2OH

Question 64

Which of the following molecules has the highest boiling point?

Accepted Answer

CH3CH2CH2CH2OH

Answer

CH3CH3

Answer

CH3OCH3